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$47+ Cheap flights from St. Louis to Baltimore (STL - BWI)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/23. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BWI
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to Baltimore/Washington are usually found in September or March, booked 75 days in advance, depart on a Tuesday or Wednesday and return on a Tuesday

Find flight deals from St. Louis to Baltimore

Cheapest flights from St. Louis to Baltimore
Explore the most affordable flight options available from St. Louis to Baltimore. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 30, 2025.

This Mytrip deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/197:24 pmSTL - BWI
1 stop18h 56mFrontier
Thu 11/208:45 pmBWI - STL
1 stop28h 12mFrontier
Deal found 10/28$110
This Booking.com deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/33:30 pmSTL - BWI
1 stop15h 12mFrontier
Sat 12/68:37 amBWI - STL
1 stop14h 56mFrontier
Deal found 10/27$111
This Booking.com deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/103:30 pmSTL - BWI
1 stop15h 12mFrontier
Mon 12/155:40 amBWI - STL
1 stop5h 12mFrontier
Deal found 10/30$121
This Mytrip deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/144:56 pmSTL - BWI
1 stop6h 17mFrontier
Tue 11/1811:19 amBWI - STL
1 stop23h 46mFrontier
Deal found 10/29$127
This Booking.com deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/132:12 pmSTL - BWI
1 stop17h 22mFrontier
Sun 11/1610:21 amBWI - STL
1 stop24h 19mFrontier
Deal found 10/30$128
This Booking.com deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/132:12 pmSTL - BWI
1 stop17h 22mMultiple Airlines
Wed 11/199:36 pmBWI - STL
1 stop13h 22mMultiple Airlines
Deal found 10/28$129
This Frontier deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/1112:04 pmSTL - BWI
1 stop11h 20mFrontier
Mon 12/155:40 amBWI - STL
1 stop5h 12mFrontier
Deal found 10/29$130
This Frontier deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/74:56 pmSTL - BWI
1 stop6h 17mFrontier
Thu 11/136:15 amBWI - STL
1 stop4h 57mFrontier
Deal found 10/28$143
This Booking.com deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/133:30 pmSTL - BWI
1 stop14h 48mFrontier
Sun 12/149:43 pmBWI - STL
1 stop12h 16mFrontier
Deal found 10/28$144
This Frontier deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/412:04 pmSTL - BWI
1 stop11h 20mFrontier
Sun 12/79:43 pmBWI - STL
1 stop12h 16mFrontier
Deal found 10/27$163
This Booking.com deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/59:54 amSTL - BWI
1 stop9h 22mFrontier
Sat 12/68:37 amBWI - STL
1 stop14h 56mFrontier
Deal found 10/30$168
This Frontier deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/129:54 amSTL - BWI
1 stop9h 22mFrontier
Mon 12/155:40 amBWI - STL
1 stop5h 12mFrontier
Deal found 10/29$169

Cheap flight deals from St. Louis to Baltimore

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Baltimore (BWI). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated October 30, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$110
(Mytrip)

One-way from

$47
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$359
Provider with most accurate pricing for Lambert-St Louis-Baltimore/Washington flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Baltimore/Washington flights.
Search Deals
From Lambert-St Louis to Baltimore/Washington
Search Deals
One-way flight from Lambert-St Louis to Baltimore/Washington
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($41 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Baltimore that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated October 30, 2025.
Use the filters below to find and compare flights from St. Louis to Baltimore that are best for you.

Fly from

St. Louis

Fly to

Baltimore

Route

Depart

Return

Price

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Thu 11/13

2:12 pm-8:34 am

1 stop17h 22m

Baltimore/Washington

Sun 11/16

10:21 am-9:40 am

1 stop24h 19m

$128

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Sat 1/24

5:11 pm-7:47 am

1 stop13h 36m

Baltimore/Washington

Tue 1/27

6:45 am-10:33 pm

2 stops16h 48m

$148

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Sun 1/25

5:11 pm-7:47 am

1 stop13h 36m

Baltimore/Washington

Tue 1/27

3:31 pm-10:33 pm

1 stop8h 02m

$150

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Mon 11/10

7:45 pm-6:29 pm

2 stops21h 44m

Baltimore/Washington

Fri 11/14

5:50 am-4:01 pm

1 stop11h 11m

$209

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Thu 12/11

6:00 am-11:14 am

1 stop4h 14m

Baltimore/Washington

Sun 12/14

6:00 am-9:50 am

1 stop4h 50m

$229

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Fri 12/5

12:45 pm-7:55 pm

2 stops6h 10m

Baltimore/Washington

Sat 12/6

10:30 am-5:00 pm

2 stops7h 30m

$239

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Sat 1/24

8:45 am-1:40 pm

1 stop3h 55m

Baltimore/Washington

Tue 1/27

7:45 am-9:25 am

Nonstop2h 40m

$263

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Wed 12/17

1:50 pm-9:35 pm

1 stop6h 45m

Baltimore/Washington

Thu 12/18

7:35 am-9:00 am

Nonstop2h 25m

$267

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Mon 12/22

5:45 am-8:45 am

Nonstop2h 00m

Baltimore/Washington

Tue 12/30

7:55 am-11:25 am

1 stop4h 30m

$267

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Wed 12/10

8:15 am-1:40 pm

1 stop4h 25m

Baltimore/Washington

Mon 12/15

7:10 am-8:35 am

Nonstop2h 25m

$267

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/30

Showing 1-10 of 24 results
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Compare providers for flights from St. Louis to Baltimore

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Baltimore in October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
MytripPrice Accuracy3 starsTrust Score*3 stars
Trip.comPrice Accuracy2 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on St. Louis-Baltimore flights, users find the pricing of Mytrip to be most consistent on Cheapflights vs. Mytrip Users can find the same prices on St. Louis-Baltimore flight deals on Cheapflights vs. Mytrip >95% of the time. Price accuracy is based on data collected from St. Louis-Baltimore flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-Baltimore flights, Cheapflights users trust Mytrip the most. Mytrip has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Baltimore flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from St. Louis to Baltimore

Have a flexible travel schedule? Discover the best time to fly to Baltimore from St. Louis with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Baltimore

How far ahead should I book a flight from St. Louis to Baltimore?

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Baltimore. Price data was last updated on October 24, 2025.

Booking 75 days in advance of your planned departure date is, on average, the best time to get cheap flights from St. Louis to Baltimore. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from St. Louis to Baltimore?

Currently, December is the cheapest month in which you can book a flight from St. Louis to Baltimore (average of $98). Flying from St. Louis to Baltimore in June is currently the most expensive (average of $198). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from STL to BWI?

Find hourly flight availability from St. Louis to Baltimore. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 30, 2025.

It’s typically best to fly out from St. Louis to Baltimore in the afternoon. Doing so could potentially save you 4% on the flight price compared to flying in the evening, which is usually more expensive.

What is the cheapest day to fly from St. Louis to Baltimore?

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Baltimore. Price data was last updated on October 26, 2025.

Travelers seeking maximum savings on their St. Louis to Baltimore flight should consider departing on Thursday at noon when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

The best insider tips for St. Louis to Baltimore flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your St. Louis to Baltimore trip
Airports
STL

Expect security screening at STL to take 5-10 minutes during off-peak times. Check real-time wait times online before heading to the airport.

Read more about STLby Taryn White
BWI

Take the MTA Light Rail from BWI to downtown Baltimore for a quick and easy trip. Shuttles connect to the MARC and Amtrak station.

Read more about BWIby Emily Zemler
Our travel experts
Emily Zemler

Emily Zemler

Expert on BWI

Emily Zemler

Emily Zemler

Emily is a freelance writer and book author based in London covering entertainment and travel. Her work has appeared in Los Angeles Times, Observer, and Conde Nast Traveler She has ventured to more than 40 countries and all seven continents, always in search of a great art museum. She has written extensively about hotels, luxury travel, and aviation.

Read more
Taryn White

Taryn White

Expert on STL

Taryn White

Taryn White

Taryn White is a freelance travel writer, digital creator, and travel advisor who has visited nearly 100 countries and all 50 states. She’s familiar with many airports and enjoys beach hopping, boutique hotels, spa experiences, and exploring local culture. Her work has appeared in Travel + Leisure, Condé Nast Traveler, National Geographic, Smithsonian Magazine, AFAR, and more.

Read more

Reviews of airlines servicing Baltimore

Get insights into the airlines that provide service to Baltimore. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Baltimore. Reviews last updated October 30, 2025.
Peruse reviews from past customers who have flown with Southwest, Delta, and American Airlines from St. Louis to Baltimore to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Overall

8.0

Boarding

8.1

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Overall

8.0

Boarding

8.1

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Delta
7.9
Good
7,993 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Overall

8.0

Boarding

8.1

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
11,030 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Overall

8.0

Boarding

8.1

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Frontier
5.8
Fair
3,123 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Overall

8.0

Boarding

8.1

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Baltimore. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How popular is this St. Louis to Baltimore flight route?

    Within the past month, 30 users have taken a look at flights from Lambert-St Louis to Baltimore/Washington.

  • How long is the flight from St. Louis to Baltimore?

    There are many flights that can get you from St. Louis to Baltimore in 4h 14m. Fly via Frontier or Delta to get the fastest option. The distance between St. Louis and Baltimore is about 736 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from St. Louis to Baltimore round-trip?

    Frontier, at $124, was found to be the cheapest airline from St. Louis to Baltimore.Alternate airlines to your destination round-trip include American Airlines and Delta. Frontier is 62% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest flights from St. Louis to Baltimore?

    The cheapest flight price from St. Louis to Baltimore is $186. On average you can expect to pay $322. The most popular route, (Lambert-St Louis - Baltimore/Washington), can usually be booked for $124.

  • Can I find deals for flights from St. Louis to Baltimore that include hotel bookings?

    Yes. In addition to deals on St. Louis to Baltimore flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Baltimore?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Baltimore.

  • Can I find deals for business class flights from St. Louis to Baltimore?

    Yes. Cheapflights offers flight deals from St. Louis to Baltimore by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from St. Louis to Baltimore?

    Currently, December is the cheapest month in which you can book a flight from St. Louis to Baltimore (average of $98). Flying from St. Louis to Baltimore in June is currently the most expensive (average of $198). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for St. Louis to Baltimore

See prices for flight routes from nearby airports that may be better suited for you.
St. Louis to Dulles Intl flights
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Top 4 airlines flying from St. Louis to Baltimore

Discover the top 4 airlines that operate flights from St. Louis to Baltimore. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$124Average$218FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$196Average$378FlexibilityNo cancel feeOn-time71%
DeltaCheapest$196Average$290FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$207Average$379FlexibilityNo cancel feeOn-time63%

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